1# Copyright 2015-2024 Free Software Foundation, Inc.
2
3# This program is free software; you can redistribute it and/or modify
4# it under the terms of the GNU General Public License as published by
5# the Free Software Foundation; either version 3 of the License, or
6# (at your option) any later version.
7#
8# This program is distributed in the hope that it will be useful,
9# but WITHOUT ANY WARRANTY; without even the implied warranty of
10# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11# GNU General Public License for more details.
12#
13# You should have received a copy of the GNU General Public License
14# along with this program.  If not, see <http://www.gnu.org/licenses/>.
15
16# This file is part of the gdb testsuite.
17
18# Test the setting of "history size" via the GDBHISTSIZE environment variable
19
20
21# We cannot expect remote hosts to see environment variables set on the
22# local machine.
23require {!is_remote host}
24
25# Check that the history size is properly set to SIZE when the environment
26# variable ENV_VAR is set to GDBHISTSIZE.
27
28proc test_histsize_history_setting { histsize size { env_var "GDBHISTSIZE" } } {
29    global env
30
31    save_vars { env(GDBHISTFILE) env(GDBHISTSIZE) env($env_var) } {
32          # These environment variables take precedence over whatever
33          # history size is set in .gdbinit.  Make sure the former is not
34          # set.
35          unset -nocomplain env(GDBHISTFILE)
36          unset -nocomplain env(GDBHISTSIZE)
37
38          # Ensure we don't accidentally pick up a .gdb_history from the
39          # testsuite directory.
40          set env(GDBHISTFILE) [standard_output_file .gdb_history]
41
42          set env($env_var) $histsize
43
44          with_test_prefix "histsize=$histsize" {
45              gdb_exit
46              gdb_start
47
48              gdb_test "show history size" "The size of the command history is $size."
49
50              if { $size == "0" } {
51                    gdb_test_no_output "show commands"
52              } elseif { $size != "1" } {
53                    gdb_test "show commands" \
54                             "    .  show history size\r\n    .  show commands"
55              }
56        }
57    }
58}
59
60test_histsize_history_setting "" "unlimited"
61test_histsize_history_setting "0" "0"
62test_histsize_history_setting "20" "20"
63test_histsize_history_setting " 20 " "20"
64test_histsize_history_setting "-5" "unlimited"
65
66# Test defaulting to 256 upon encountering a non-numeric GDBHISTSIZE.
67test_histsize_history_setting "not_an_integer" "256"
68test_histsize_history_setting "10zab" "256"
69test_histsize_history_setting "-5ab" "256"
70
71# A huge number (hopefully larger than INT_MAX)
72test_histsize_history_setting "99999999999999999999999999999999999" "unlimited"
73
74# We no longer read HISTSIZE
75test_histsize_history_setting "50" "256" "HISTSIZE"
76